How is plywood bubble happen and how to detect it ?

Automatic Plywood bubble detect line

1 :How did the plywood bubble appears ?

In the plywood production process, if the veneer has excessive moisture content and serious

deformation & warping, coupled with uneven gluing and poor-quality adhesive caused by lax control in the

gluing process, as well as process defects such as substandard temperature, insufficient hot-pressing time

and uneven pressure distribution in the hot-pressing link, the final plywood products are extremely prone to

quality defects like bubble and hollow boards.

How is the plywood bubble detect line work ?

The Automatic plywood bubble detect machine is equipped with 7 to 10 ultrasonic transmitting probes, forming an

up-down opposite detection array with receiving probes. When plywood passes through the detection area at a constant

speed, the probes emit high-frequency ultrasonic waves that penetrate the board. Relying on the strong reflection and

severe attenuation characteristics of ultrasonic waves at the wood-air interface, it can accurately identify defects such as

internal voids, bulges and delamination in plywood, realizing online non-destructive testing of hollow plywood boards.

 what an aumatic plywood quality bubble line contains ?

The total line contain 7 parts ,and function as following :

Chain conveyor – 1 pc. : ready plywood

Lift table – 3 pcs. : plywood lift and reduce

Auto feeding – 1 pc: Auto feeding plywood to the total line

Roller conveyor (3.5 m.) – 1 pc. : conveyor plywood to defect machine

Plywood defects detect machine – 1 pc. : the main machine working

Roller conveyor (4.5 m.) – 1 pc.: conveyor plywood to stack

Auto stacker – 2 pc. : stack qualified plywood and unqualified plywood

Service platform – 1 pc.: manual work stand platform